... but it is not legal to threaten disciplinary action or insist that it is "mandatory".
In that case, get any and all documentation, record (notes) conversations (where, when and who). Then if you feel 'threatened', contact your state attorney and department of health.
Keep in mind, it's easy for me to type all this sitting here, BUT all 'they' have to do is mess up just one documented time!
My best hopes for you! I hate being trapped twix a needed employment and whim$ of management, with my sense of 'right' right in the middle. Good luck!